Callaway Razr X Muscleback Irons

Peek inside the bags of Callaway staff players who demand the ultimate game-enhancing irons and you might spot the RAZR X Muscleback irons, but Luke Williams, Callaway's director of product design, concedes they’re not for everyone.

"Really good amateur players and college players could play this club," he said. "There's a market for it, but it's small."

Originally sold as Callaway's Tour Authentic X Prototype irons, the RAZR X Muscleback irons are forged from carbon steel to amplify feel. They have an ultra-thin topline and narrow sole, which accomplished players tend to like.

There is a misconception among many golfers that making a forged blade is not especially difficult because they're devoid of bells and whistles. However, top-level players are extremely picky about aesthetics, subtleties and feel. Callaway engineers consulted with Tour players to make sure they liked the amount of offset on the RAZR X Musclebacks, that blade lengths were appropriate and the different parts of the club flowed into each other.

In other words, Callaway wanted to be sure the details were pleasing to the eyes and hands of the pros.

There are numerous shaft offerings for these irons, which cost $999 for eight clubs. A 2-iron also is available.

TaylorMade R15 fairway woods

Harkening back to the shape of the original Rescue club, the new R15 Rescue has a smaller “peanut” head shape (99cc), commonly preferred by tour staff professionals and amateurs who want to shape shots.